Update the files that need to be read/write in makerel, removing one

Update the files that need to be read/write in makerel, removing one
exterminated file, one file that is now a dummy, and adding in various
files that are actually read/write because they are regenerated from
source files. Change the type of regcharclass.h to read/write in
Perforce as it is auto-generated. (And all other auto-generated files
are read/write. There's some irony here - the only read/write files
are the ones you shouldn't edit. All the ones you can edit are read
only.)

p4raw-id: //depot/perl@32427